R3721-F3210-F3171-HP High-End Firewalls Network Management Configuration Guide-6PW101

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Enabling an interface to send small hello packets
IS-IS messages cannot be fragmented at the IP layer because they are directly encapsulated into frames.
Any two IS-IS neighboring routers need to negotiate a common MTU. To avoid sending big hellos for
saving bandwidth, enable the interface to send small hello packets without CLVs.
To enable an interface to send small hello packets:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter interface view.
interface interface-type
interface-number
N/A
3. Enable the interface to send
small hello packets without
CLVs.
isis small-hello
By default, standard hello packets
are sent.
Configuring LSP parameters
Configuring LSP timers
1. Specify the maximum age of LSPs.
Each LSP has an age that decreases in the LSDB. Any LSP with an age of 0 is deleted from the LSDB.
You can adjust the age value based on the scale of a network.
To specify the maximum age of LSPs:
Ste
p
Command Remarks
1. Enter system view. system-view N/A
2. Enter IS-IS view.
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
N/A
3. Specify the maximum LSP
age.
timer lsp-max-age seconds
Optional.
1200 seconds by default.
2. Specify the LSP refresh interval and generation interval.
Each router needs to refresh LSPs generated by itself at a configurable interval and send them to
other routers to prevent valid routes from being aged out. A smaller refresh interval speeds up
network convergence but consumes more bandwidth.
When the network topology changes, for example, a neighbor is down/up, or the interface metric,
system ID or area ID is changed, the router generates an LSP after a configurable interval. If such
changes occur frequently, excessive LSPs are generated, consuming a large amount of router
resources and bandwidth. To solve the problem, you can adjust the LSP generation interval.
To specify the LSP refresh interval and generation interval:
Ste
p
Command Remarks
1. Enter system view.
system-view N/A
2. Enter IS-IS view.
isis [ process-id ] [ vpn-instance
vpn-instance-name ]
N/A